Lennox 52M40 Pressure Switch Els PW 17895 it allows the room pressure

it allows the room pressure monitor to report a true average static pressure rather than reacting to momentary spikes

also identified in technical catalogs as the Watts KSTEM-12

Superior Material Integrity: Resistant to chemical degradation from POE oils and common refrigerants

Environmental Protection: The NEMA 4 enclosure safeguards internal components against moisture and debris

the 100-0017-001 is required if you are monitoring a second circuit (DS models) or if the primary sensor has been compromised

Lennox 52M40 Pressure Switch Els PW 17895 it allows the room pressureAs a field tested Lennox 52M40 Pressure Switch, this genuine OEM component is a critical safety interface for residential and commercial gas furnaces. Engineered for precise pneumatic monitoring, this SPST furnace pressure switch features a single pole single throw configuration designed to verify inducer motor performance. The integrated 1 4" barb connection allows for a secure, airtight fit with standard pressure tubing, ensuring the system